Jisho

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Noun
1. standard deviation; SDMathematics
Wikipedia definition
2. Standard deviationIn statistics and probability theory, standard deviation (represented by the symbol σ) shows how much variation or "dispersion" exists from the average (mean, or expected value). A low standard deviation indicates that the data points tend to be very close to the mean, whereas high standard deviation indicates that the data points are spread out over a large range of values.
Read “Standard deviation” on English Wikipedia
Read “標準偏差” on Japanese Wikipedia
Read “Standard deviation” on DBpedia

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